Legal claims defining the scope of protection, as filed with the USPTO.
1. A method performed by a device to detect band availability, the method comprising: obtaining a digital sample set of a selected frequency band; calculating an autocorrelation function using the digital sample set, wherein the autocorrelation function is calculated by excluding a set of initial correlation delay values indicating adjacent channel interference from the calculation of the autocorrelation function to reveal a sinusoidal property of a frequency modulation signal; calculating a decision statistic; and determining if a frequency modulation signal is operating in the selected frequency band based on the decision statistic.
2. The method of claim 1 , further comprising: providing an indication of the presence or absence of a frequency modulation signal use in the selected frequency band.
3. The method of claim 1 , further comprising: utilizing the selected frequency band if no frequency modulation signal is present in the selected band.
4. The method of claim 1 , further comprising: selecting a next frequency band and performing the steps of claim 1 .
5. The method of claim 1 , further comprising the step of initially receiving a signal in a selected frequency band from either a user-selection or an automatically generated frequency band.
6. The method of claim 1 , wherein the step of obtaining a digital sample of the selected frequency bandwidth comprises performing an analog to digital conversion of the selected frequency band.
7. The method of claim 1 , wherein the step of calculating a decision statistic comprises computing a decision statistic that represents a maximum value of statistics calculated using multiple carrier frequency values in the selected frequency band.
8. The method of claim 1 , wherein the step of calculating a decision statistic comprises computing a decision statistic based on a single carrier frequency in the selected band.
9. The method of claim 1 , wherein the step of determining if a frequency modulation signal is operating in the selected frequency band based on the decision statistic comprises determining if the value of the decision statistic exceeds a threshold.
10. A device to detect frequency modulated signals in a frequency band, the device comprising: an analog to digital converter to produce a digital sample of a selected band; a processor having access to memory, wherein the processor calculates an autocorrelation function using the digital sample such that the autocorrelation function is calculated by excluding a set of initial correlation delay values indicating adjacent channel interference from the calculation of the autocorrelation function to reveal a sinusoidal property of frequency modulation signal, wherein the processor calculates a decision statistic using the autocorrelation function, and determines if a frequency modulation signal use is present in the selected frequency band based on the decision statistic.
11. The device of claim 10 , further comprising: a display and user interface accommodating input and outputs functions.
12. The device of claim 10 , further comprising an interface to a transceiver for use in the event that no frequency modulation signal is detected in the selected frequency band.
13. The device of claim 10 , wherein the device is a mobile device.
14. The device of claim 10 , wherein the processor calculates the decision statistic which represents a maximum value of statistics calculated using multiple carrier frequency values in the selected frequency band.
15. The device of claim 10 , wherein the processor calculates the decision statistic based on a single carrier frequency in the selected band.
Unknown
January 12, 2016
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